[llvm] [coro][pgp] Do not insert counters in the `suspend` block (PR #71262)

[Mircea Trofin via llvm-commits]

mtrofin wrote:

> > Can a testcase be added in instrumentation test dir as well?
> 
> I could copy the ones I edited over, is that what you mean?

Copied them, and removed the non-PGO `RUN`.

I think it makes sense to keep both the original test cases and the copies, at least for awareness, but can be convinced otherwise.

https://github.com/llvm/llvm-project/pull/71262